Simonyi now runs Intentional Software, which he co-founded
in 2002. He is also an experienced pilot.

Japanese entrepreneur Daisuke Enomoto is in training and is
expected to fly later this year.

At the moment space tourists take off with a two-man
Russian-U.S. crew in a Soyuz rocket, spend just over a week at
the space station and return to earth with the outgoing crew.
The trip comes with a reported price tag of $20 million.

Russia can also sell spare seats on its spacecraft to
governments. Brazil's first astronaut Marcos Pontes arrived at
the station on Saturday.